Area shadows from 2d shapes using ray - grid intersection. Breakdown images in the thread.
#UnrealEngine
#UnrealEngine
The intersection function is a simplified, 2d version of the box intersection function found in the engine. When you want to do this in a loop, its a good practive to precompute the inverse ray direction. 
This is the actual material. The intersection function is called in a loop, to advance the ray through the grid (pixels of the texture).
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